Have you ever wondered how composers of the past wrote so much music in such a short period of time? Where, for instance, did Haydn find the time to write 104 symphonies, 83 string quartets, 52 pianosonatas, forty piano trios, eleven keyboard concertos, five masses, and three oratorios, among countless other pieces? Undoubtedly, the superb talent with which these composers were born had much to do with their prolific output. But there must be more to the story, for talent alone doesn't account for difference in productivity between, say, Mozart and Stravinsky, both of whom were supremely gifted...